summaryrefslogtreecommitdiffstats
path: root/arch/um/Makefile
blob: d944c343acdb26ab68a9d3243fa58c95ee090868 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
#
# This file is included by the global makefile so that you can add your own
# architecture-specific flags and dependencies.
#
# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
# Licensed under the GPL
#

ARCH_DIR := arch/um
OS := $(shell uname -s)
# We require bash because the vmlinux link and loader script cpp use bash
# features.
SHELL := /bin/bash

filechk_gen_header = $<

core-y			+= $(ARCH_DIR)/kernel/		\
			   $(ARCH_DIR)/drivers/		\
			   $(ARCH_DIR)/os-$(OS)/

MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas

include $(srctree)/$(ARCH_DIR)/Makefile-skas

ARCH_INCLUDE	:= -I$(srctree)/$(ARCH_DIR)/include/shared
ARCH_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)/shared
ifneq ($(KBUILD_SRC),)
ARCH_INCLUDE	+= -I$(ARCH_DIR)/include/shared # for two generated files
endif
KBUILD_CPPFLAGS += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)

# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
# named - it's a common symbol in libpcap, so we get a binary which crashes.
#
# Same things for in6addr_loopback and mktime - found in libc. For these two we
# only get link-time error, luckily.
#
# These apply to USER_CFLAGS to.

KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
	-Din6addr_loopback=kernel_in6addr_loopback \
	-Din6addr_any=kernel_in6addr_any

KBUILD_AFLAGS += $(ARCH_INCLUDE)

USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
	$(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
	$(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64

include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)

#This will adjust *FLAGS accordingly to the platform.
include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)

KBUILD_CPPFLAGS += -I$(srctree)/arch/$(HEADER_ARCH)/include

# -Derrno=kernel_errno - This turns all kernel references to errno into
# kernel_errno to separate them from the libc errno.  This allows -fno-common
# in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
# errnos.
# These apply to kernelspace only.
#
# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
# defines more robust

KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
KBUILD_CFLAGS += $(KERNEL_DEFINES)

PHONY += linux

all: linux

linux: vmlinux
	@echo '  LINK $@'
	$(Q)ln -f $< $@

define archhelp
  echo '* linux		- Binary kernel image (./linux) - for backward'
  echo '		   compatibility only, this creates a hard link to the'
  echo '		   real kernel binary, the "vmlinux" binary you'
  echo '		   find in the kernel root.'
endef

KBUILD_KCONFIG := arch/um/Kconfig.$(HEADER_ARCH)

archprepare: $(ARCH_DIR)/include/shared/user_constants.h
prepare: $(ARCH_DIR)/include/shared/kern_constants.h

LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib

CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
	$(call cc-option, -fno-stack-protector,) \
	$(call cc-option, -fno-stack-protector-all,)

CONFIG_KERNEL_STACK_ORDER ?= 2
STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )

CPPFLAGS_vmlinux.lds = -U$(SUBARCH) -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
	-DELF_FORMAT="$(ELF_FORMAT)" -DKERNEL_STACK_SIZE=$(STACK_SIZE)

# The wrappers will select whether using "malloc" or the kernel allocator.
LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc

LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))

CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
define cmd_vmlinux__
	$(CC) $(CFLAGS_vmlinux) -o $@ \
	-Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
	-Wl,--start-group $(vmlinux-main) -Wl,--end-group \
	-lutil \
	$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
	FORCE ,$^) ; rm -f linux
endef

# When cleaning we don't include .config, so we don't include
# TT or skas makefiles and don't clean skas_ptregs.h.
CLEAN_FILES += linux x.i gmon.out \
	$(ARCH_DIR)/include/shared/user_constants.h \
	$(ARCH_DIR)/include/shared/kern_constants.h

archclean:
	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
		-o -name '*.gcov' \) -type f -print | xargs rm -f

$(objtree)/$(ARCH_DIR)/include/shared:
	@echo '  MKDIR $@'
	$(Q)mkdir -p $@

# Generated files

$(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
	$(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@

define filechk_gen-asm-offsets
        (set -e; \
         echo "/*"; \
         echo " * DO NOT MODIFY."; \
         echo " *"; \
         echo " * This file was generated by arch/$(ARCH)/Makefile"; \
         echo " *"; \
         echo " */"; \
         echo ""; \
         sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
         echo ""; )
endef

$(ARCH_DIR)/include/shared/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
	$(call filechk,gen-asm-offsets)

$(ARCH_DIR)/include/shared/kern_constants.h: $(objtree)/$(ARCH_DIR)/include/shared
	@echo '  SYMLINK $@'
	$(Q)ln -sf ../../../../include/asm/asm-offsets.h $@

export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH DEV_NULL_PATH
OpenPOWER on IntegriCloud